Productivity and nitrogen-use efficiency yardsticks in conventional and Bt cotton hybrids on rainfed Vertisols

M V Venugopalan; Rachana Deshmukh; K B Hebbar; N R Tandulkar

doi:10.56093/ijas.v82i7.21694

Authors

M V Venugopalan Central Institute for Cotton Research, P B No. 2, Shankar Nagar, Nagpur 440 010
Rachana Deshmukh Central Institute for Cotton Research, P B No. 2, Shankar Nagar, Nagpur 440 010
K B Hebbar Central Institute for Cotton Research, P B No. 2, Shankar Nagar, Nagpur 440 010
N R Tandulkar Central Institute for Cotton Research, P B No. 2, Shankar Nagar, Nagpur 440 010

https://doi.org/10.56093/ijas.v82i7.21694

Keywords:

N-uptake efficiency, N utilization efficiency, Bt cotton, Sowing time

Abstract

The yield of Bt hybrids (MCEH 184 and RCH 2) was higher than non-Bt NCS 145 and among Bt hybrids, the medium duration RCH 32 Bt was superior to short-duration MECH 184 under normal sowing date. Under late sown conditions, the performance of both RCH 2 Bt and NCS-145 were similar and Bt hybrids are not likely to be more advantageous late sown conditions where a decline in temperature induces cut out. N UtiE and not N Upt E was primarily responsible for a higher NUE in Bt hybrids RCH 2 and MECH 184 than the non-Bt hybrid NCS-145. A higher HI enabled Bt hybrids to utilize N more efficiently.

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